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Dear DVGI Members and Friends,
DVGI invites you to our September 2023 Dinner Meeting at Valley Forge Casino. The meeting will feature the 2023 DVGI Project of the Year -The Laurel Rittenhouse Squarepresented by Bashar Qubain, Ph.D., P.E. of GeoStructures, Inc. An abstract of the lecture and speaker bio are below.
Social hour will start at 5:30PM followed by dinner at 6:30PM with the presentation to follow.
Please note our vendor is requiring advance notice for headcount, therefore we request your registration by Tuesday September 12, 2023.
Please click on the link below to register.
Abstract
A 52-story high rise building in Philadelphia is constructed adjacent to a 3-story historic structure, supported on a rubble foundation at a depth of 8 ft below grade. The high rise is supported on a mat foundation at a depth 36 ft below grade with an average service contact pressure of 14 ksf. Evidently, the existing foundation requires underpinning but extra care is necessary to safeguard the historic building. A detailed finite element analysis, accounting for the construction sequence, showed that the mat foundation would settle about 1.5 in. Although such settlement would be acceptable for the high rise it would cause intolerable distress to the historic building by dragging down its underpinning. To minimize the settlement impact, an innovative micropile solution was implemented to safely transfer the underpinning load into the underlying mica schist bedrock and prevent the existing building from being overstressed by the mat foundation. Validation of the concept was achieved by FEM modeling of the mat foundation together with its surroundings. Settlement monitoring records were also carried out until the building was topped off and showed that the settlement had indeed stabilized with measurements in remarkable agreement with the FEM results. The new building was completed almost two years ago and the adjacent historic building has been functioning well without any signs of distress.
About the Speaker
Bashar is the founder and president of GeoStructures, Inc. He has over 30 years of professional experience in geotechnical engineering for buildings, bridges and sensitive machines. His expertise and research interests are in foundation analysis and design and soil-structure interaction. Bashar served as the chief geotechnical engineer on many transportation and high-rise projects.
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