This experimental study analyzed the reduction of the load capacity of the system support according to the uninstall bracing members by loading the ultimate load to the 3 - story system support assembly with the presence of bracing members as the key parameter. The load capacity of the 3-story specimen without bracing members is 38.4% of that of the 3-story specimen with bracing members. It is necessary to accurately reflect the installation plan of the bracing members and examine the structural safety of the system support assembly, not a single member, because there is a significant decrease in the load capacity of the system support assembly according to the uninstall of the bracing members.

This paper developed the guideline for the safety and health(S&H) file drawn by a client in construction plan stage. According to the announcement of revised Occupational Safety Health Act(February 9, 2018), the construction client should make or manage the three S&H files in the plan, design, and work stages respectively. By analyzing S&H management systems led by the client and surveying the opinion of construction participators, the contents and practical method of the S&H file in the plan stage was proposed. Client should control hazard in construction site through the S&H file. And, it should include important S&H condition dealt with design and work stages as well as selection method of competent designer and contractors with S&H capacity.

This paper investigates the safety and health role processes that the client should perform at each phase of the construction project. Since the client is one of the top decision makers in the whole construction project, the client should give roles and responsibilities for safety and health of workers. Advanced system of occupational safety and health management led by the client was analyzed in order to actively participate in occupational accident prevention activities according to the client’s authority. The role of the client in the overall construction work such as planning, design and construction process was derived.

본 연구에서는 보강토 옹벽 점검 자료를 바탕으로 보강토 옹벽의 상태평가항목의 가중치를 새롭게 제안하고 결함점수 및 결함지수 를 제안하였다. 161개소의 보강토 옹벽의 점검결과를 근거로 다중회귀분석과 엔트로피 기법을 이용하여 상태평가항목별 가중치를 산정하였 으며, 또한 전문가를 대상으로 AHP 기법을 활용하여 평가항목별 가중치를 산정하였다. 각 기법에서 도출된 가중치를 활용하여 혼한 가중치를 제안하였으며, 제안 가중치를 토대로 결함점수 및 결함지수를 제안하여 기존 161개소 현장에 적용하여 현재의 가중치와 제안 가중치에 의한 현장별 위험도 순위를 비교 분석하였다. 다중회귀분석, AHP 기법, 엔트로피 기법을 활용하여 분석한 결과 상태평가항목의 가중치 순위가 변동 이 컸으며, 현재 상태평가항목의 가중치와 달리 가중치 순위의 중복은 발생하지 않았다. 특히, 다중회귀분석 결과에서는 특정 상태평가항목이 전체 가중치의 70% 이상을 차지하는 결과가 도출되었다. 제안한 혼합 가중치를 기존 보강토 옹벽 데이터에 적용한 결과, 상태평가항목의 가중 치 중복은 발생하지 않았으며, 대상 보강토 옹벽 161 개소 중 16 개소의 위험도 순위 상승과 31 개소의 위험도 하락이 발생하였다.

The purpose of this study is to provide client safety and health management duty in the construction industry. Most regulations did not give direct roles and duty to client in construction industry. As a result of the survey on construction workers who have the greatest influence on the prevention of industrial accidents, the clients and constructors chose contractor the most. Safety managers and supervisors chose client the most. Therefore, it is necessary to manage safety and health centered on the client in order to prevent fundamental disasters.

Collapse of reinforced earth retaining wall due to improper design and construction is still occurring during construction and operation. While most studies of reinforced retaining walls are focused on the mechanistic behavior, there is little study on the improvement of assessment item, which is used to examine the safety of retaining wall, based on the existed inspection data. This study proposed new weighting factor of assessment item by utilizing multiple regression analysis technique, AHP method, and entropy method for the existed inspection data of reinforced earth retaining wall. Compared to the existed weighting factor, the value and the rank of proposed weighting factors are changed. By applying the proposed weighting factors to the existing retaining walls of 161 sites, fragility region of 47 sites is changed.

This paper analyzed the effects of rotational stiffness of wedge connection between vertical and horizontal members of system supports. By simulating the connection condition both a hinge connection, which is considered in the design stage, and a spring with the rotational stiffness reflecting the actual behavior, the critical buckling load and the maximum combination stress ratio are compared. The results show that hinge condition somewhat underestimate the actual behavior of vertical members of system supports. However, it is also noted that the horizontal member represents the increased stress due to the rotational stiffness of the connection.

Collapse of reinforced earth retaining wall due to improper design and construction is still occurring during construction and operation. While most studies of reinforced retaining walls are focused on the mechanistic behavior, there is little study on the improvement of assessment item, which is used to examine the safety of retaining wall, based on the existed inspection data. This study proposed new weighting factor of assessment item by utilizing multiple regression analysis technique, AHP method, and entropy method for the existed inspection data of reinforced earth retaining wall. Compared to the existed weighting factor, the value and the rank of proposed weighting factors are changed. By applying the proposed weighting factors to the existing retaining walls of 161 sites, fragility region of 47 sites is changed.

안전보건 민간위탁사업은 안전보건관리 능력이 취약하여 재해발생 가능성이 높은 고위험군 50인 미만 소규모 사업장의 재해예방활동을 민간기관의 기술 지도를 통하여 집중 지원함으로써 산업재해를 예방하는 사업이며, 안전보건 민간위탁 사업 중 건설 분야 민간위탁사업의 경우 총 공사금액 3억원 미만 영세규모 건설현장 및 영세규모 건설업체를 대상으로 민간 재해예방기관의 위탁을 통해 밀착지원과 감성지원으로 건설재해 예방을 추진 목적으로 하고 있다. 본 연구에서는 건설 분야 민간위탁 사업의 운영현황, 수행기관 및 사업장 분석, 그리고 연도별 성과를 분석하여 향후 건설 분야 민간위탁사업의 방향을 제시하고자 하였다. 2002년부터 2013년까지의 재해율과 사망 만인율을 분석한 결과, 건설 분야 민간위탁 사업 초기에 비해 민간위탁사업으로 소규모 건설현장의 재해율과 사망 만인율은 크게 감소한 것으로 나타났으나, 최근에는 재해율이 증가되는 것으로 나타났다. 따라서, 소규모 건설현장에 대한 민간위탁사업은 건설업 사업장의 산업재해 감소에 기여하였으나, 최근 환경 변화를 반영하여 사업이 보다 실효성 있는 방향으로의 전환될 필요가 있는 것으로 판단된다.